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Production of formed cellulose products - comprises spinning a solution of cellulose in aqueous tert.amine oxide and recycling the precipitation bath after regeneration to a specified range of pH
Production of formed cellulose products - comprises spinning a solution of cellulose in aqueous tert.amine oxide and recycling the precipitation bath after regeneration to a specified range of pH
A process for the production of formed cellulosic products(CM), comprising (A) dissolving cellulose in an aqueous solution of tert. amine oxide, preferably N-methylmorpholine N-oxide (NMMO), (B) forming the solution and passing it through an aqueous precipitation bath to give the formed product and a used bath, and (C) regenerating the bath to give NMMO solution which is then reused in step (A). The solution used in (A) has a pH value with upper and lower limits depending on concentration and defined by the equation: pH = -0.0015 x A2 + 0.2816 x A + f, where A = concentration of NMMO = 40-86 (preferably 70-80) wt%, and f = 1.00 for the upper limit and -1.80, preferably -1.00, for the lower limit. Also claimed is (i) a process as above in which a regenerated amine oxide solution with a pH of 10.5-13.5 is used in step (A), and (ii) regenerated, concentrated aqueous solutions of amine oxide, especially NMMO, as defined above, for the production of formed cellulose products.
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机译：一种生产成型的纤维素产品（CM）的方法，包括（A）将纤维素溶解在叔叔水溶液中。氧化胺，最好是N-甲基吗啉N-氧化物（NMMO），（B）形成溶液，将其通过水性沉淀浴，得到所形成的产物和用过的浴，（C）使该浴再生，得到NMMO溶液，然后在步骤（A）中重新使用它。 （A）中使用的溶液的pH值取决于浓度的上限和下限，并由以下公式定义：pH = -0.0015 x A2 + 0.2816 x A + f，其中A = NMMO的浓度= 40-86（最好是70-80％（重量），上限为f ＝ 1.00，下限为-1.80，优选-1.00。还要求保护的是（i）上述方法，其中在步骤（A）中使用pH为10.5-13.5的再生氧化胺溶液，和（ii）再生的浓缩氧化胺水溶液，尤其是如定义的NMMO。以上，用于生产成型的纤维素产品。
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